Coen C-3
Coen C-3 is an earth dam located in Sonoma County, California, built in 1982. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Coen C-3
The primary purpose of Coen C-3 is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Frei Brothers Reserve And Gallo Glass Company (private). It impounds the Tr Dry Creek.
The dam stands 97 feet tall and stretches 627 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 480 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1982, the structure is 44 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 02/05/2025.
At 97 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Tr Dry Creek |
| Coordinates | 38.67280, -122.91040 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 97 ft |
| Dam Height | 97 ft |
| Dam Length | 627 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 480 acre-ft |
| Max Storage | 480 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Frei Brothers Reserve and Gallo Glass Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/05/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01317 |
| Federal ID | CA01317 |
| More Info | State Dam Safety Program |